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nfsd: use proper net while reading "exports" file

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Functuon "exports_open" is used for both "/proc/fs/nfs/exports" and
"/proc/fs/nfsd/exports" files.
Now NFSd filesystem is containerised, so proper net can be taken from
superblock for "/proc/fs/nfsd/exports" reader.
But for "/proc/fs/nfsd/exports" only current->nsproxy->net_ns can be used.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Stanislav Kinsbursky 2013-02-01 15:56:17 +03:00 committed by J. Bruce Fields
parent 11f779421a
commit 96d851c4d2
1 changed files with 25 additions and 6 deletions
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31
fs/nfsd/nfsctl.c
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@ -125,11 +125,11 @@ static const struct file_operations transaction_ops = {
.llseek = default_llseek,
};
static int exports_open(struct inode *inode, struct file *file)
static int exports_net_open(struct net *net, struct file *file)
{
int err;
struct seq_file *seq;
struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
err = seq_open(file, &nfs_exports_op);
if (err)
@ -140,8 +140,26 @@ static int exports_open(struct inode *inode, struct file *file)
return 0;
}
static const struct file_operations exports_operations = {
.open = exports_open,
static int exports_proc_open(struct inode *inode, struct file *file)
{
return exports_net_open(current->nsproxy->net_ns, file);
}
static const struct file_operations exports_proc_operations = {
.open = exports_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
.owner = THIS_MODULE,
};
static int exports_nfsd_open(struct inode *inode, struct file *file)
{
return exports_net_open(inode->i_sb->s_fs_info, file);
}
static const struct file_operations exports_nfsd_operations = {
.open = exports_nfsd_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
@ -1018,7 +1036,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
{
static struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
&export_features_operations, S_IRUGO},
[NFSD_FO_UnlockIP] = {"unlock_ip",
@ -1081,7 +1099,8 @@ static int create_proc_exports_entry(void)
entry = proc_mkdir("fs/nfs", NULL);
if (!entry)
return -ENOMEM;
entry = proc_create("exports", 0, entry, &exports_operations);
entry = proc_create("exports", 0, entry,
&exports_proc_operations);
if (!entry)
return -ENOMEM;
return 0;